| Thomas Cup | 04/29 09:00 | - | Kodai Naraoka v Kai Schaefer | L | 2-0 | |
| Thomas Cup | 04/28 05:00 | - | Tien Chen Chou v Kai Schaefer | L | 2-1 | |
| European Championships | 04/10 17:00 | - | Viktor Axelsen v Kai Schaefer | L | 2-0 | |
| Spain Masters Qual | 03/26 09:45 | 4 | Yushi Tanaka v Kai Schaefer | L | 2-0 | |
| Polish Open | 03/23 15:00 | - | Kai Schaefer v Viktor Ording Kauffman | L | 1-2 | |
| Polish Open | 03/23 15:00 | - | Kai Schaefer v Victor Kauffmann | L | 1-2 | |
| Polish Open | 03/23 09:00 | - | Kalle Koljonen v Kai Schaefer | W | 0-2 | |
| Polish Open | 03/22 14:40 | - | Kai Schaefer v Markus Barth | W | 2-0 | |
| Orleans Masters Qual | 03/12 13:40 | - | Daniil Dubovenko v Kai Schaefer | L | 2-1 | |
| Orleans Masters Qual | 03/12 11:55 | 4 | Kai Schaefer v Danylo Bosniuk | W | 2-0 | |
| Portugal Int. | 03/09 17:20 | - | Matthias Kicklitz v Kai Schaefer | L | 2-0 | |
| Portugal Int. | 03/09 10:40 | - | Kai Schaefer v Rafael Gavois | W | 2-0 |
Kai Hendrik Schäfer (born 13 June 1993) is a German badminton player. He competed at the 2020 Tokyo Olympics.